SGI (image file format) - Revision history

Jsummers: /* Sample files */ Re-updated samples link

2025-08-09T15:53:15Z

‎Sample files: Re-updated samples link

Jsummers: Undo revision 46734 by Dexvertbot (talk)

2025-08-09T15:52:37Z

Undo revision 46734 by Dexvertbot (talk)

Jsummers: /* Software */

2024-05-04T18:24:23Z

‎Software

Dexvertbot: Change telparia.com samples link to template

2023-12-28T02:57:14Z

Change telparia.com samples link to template

Jsummers: Deleted release date. (Don't know the correct date.)

2023-01-07T16:11:26Z

Deleted release date. (Don't know the correct date.)

Jsummers: Restructuring and various updates

2022-12-02T16:28:47Z

Restructuring and various updates

Jsummers: /* Specifications */

2022-12-02T16:19:11Z

‎Specifications

Sembiance: /* Sample files */

2020-08-01T16:48:19Z

‎Sample files

Dan Tobias at 04:35, 29 January 2020

2020-01-29T04:35:24Z

Jsummers: Category:Silicon Graphics

2019-09-28T16:40:31Z

Category:Silicon Graphics

@@ Line 44: / Line 44: @@
 == Sample files ==
 * [http://ftp.funet.fi/index/graphics/packages/volvis/RGB.tar.Z RGB.tar.Z]
-* https://telparia.com/fileFormatSamples/image/sgi/
+* {{DexvertSamples|image/sgi}}
 == Links ==

@@ Line 23: / Line 23: @@
 * Colormapped (but no palette is stored in the file) (obsolete)
 * Colormap (file contains only a palette; no image) (obsolete)
-* Grayscale alpha images also exist, though they're not covered in the specification.
+* Grayscale+alpha images also exist, though they're not covered in the specification.
 == Identification ==
@@ Line 44: / Line 44: @@
 == Sample files ==
 * [http://ftp.funet.fi/index/graphics/packages/volvis/RGB.tar.Z RGB.tar.Z]
-* {{DexvertSamples|image/sgi}}
+* https://telparia.com/fileFormatSamples/image/sgi/
 == Links ==

@@ Line 40: / Line 40: @@
 * [[Tom's Viewer]]
 * [http://svn.osgeo.org/grass/grass/branches/releasebranch_5_5/src.contrib/CERL/SGI/libimage/ libimage]
 == Sample files ==

@@ Line 23: / Line 23: @@
 * Colormapped (but no palette is stored in the file) (obsolete)
 * Colormap (file contains only a palette; no image) (obsolete)
-* Grayscale+alpha images also exist, though they're not covered in the specification.
+* Grayscale alpha images also exist, though they're not covered in the specification.
 == Identification ==
@@ Line 43: / Line 43: @@
 == Sample files ==
 * [http://ftp.funet.fi/index/graphics/packages/volvis/RGB.tar.Z RGB.tar.Z]
-* https://telparia.com/fileFormatSamples/image/sgi/
+* {{DexvertSamples|image/sgi}}
 == Links ==

@@ Line 5: / Line 5: @@
 |pronom={{PRONOM|x-fmt/140}}
 |wikidata={{wikidata|Q7514956}}
 }}
 '''SGI image''' (also known as '''IRIS''', and sometimes called '''RGB''' or '''Irix RGB''') is a raster image file format. It is associated with an image library used on Silicon Graphics workstations. The image may be uncompressed, or use [[Run-length encoding|RLE]] compression.

@@ Line 2: / Line 2: @@
 |formattype=electronic
 |subcat=Graphics
-|extensions={{ext|sgi}}, {{ext|bw}}, {{ext|rgb}}, {{ext|rgba}}
+|extensions={{ext|sgi}}, {{ext|bw}}, {{ext|rgb}}, {{ext|rgba}}, others
 |pronom={{PRONOM|x-fmt/140}}
 |wikidata={{wikidata|Q7514956}}
 }}
-'''SGI''' (also known as '''IRIS''', and sometimes called '''RGB''' or '''Irix RGB''') is a raster image file format. The image may be uncompressed, or use [[Run-length encoding|RLE]] compression.
+'''SGI image''' (also known as '''IRIS''', and sometimes called '''RGB''' or '''Irix RGB''') is a raster image file format. It is associated with an image library used on Silicon Graphics workstations. The image may be uncompressed, or use [[Run-length encoding|RLE]] compression.
-SGI probably stands for '''Silicon Graphics Image'''.
+== Format details ==
-== Image types ==
+=== File structure ===
-SGI supports the following image types:
+SGI image files start with a 512-byte fixed header, most of which is unused. If the image is uncompressed, the pixel data follows. Compressed images have a scan-line table, followed by the compressed pixel data.
 * Grayscale, 8 or 16 bits/sample
 * RGB, 8 or 16 bits/sample
@@ Line 18: / Line 24: @@
 * Colormapped (but no palette is stored in the file) (obsolete)
 * Colormap (file contains only a palette; no image) (obsolete)
+* Grayscale+alpha images also exist, though they're not covered in the specification.
-== Format ==
-SGI files start with a 512-byte fixed header, most of which is unused. If the image is uncompressed, the pixel data follows. Compressed images have a scanline table, followed by the compressed pixel data.
-−
-The pixel data is stored from bottom-up, instead of top-down as in most image formats.
 == Identification ==
-SGI files begin with bytes <code>01 DA</code>.
+Files begin with bytes {{magic|01 DA}}.
 == Specifications ==
@@ Line 44: / Line 46: @@
 * https://telparia.com/fileFormatSamples/image/sgi/
-== External links ==
+== Links ==
 * [[Wikipedia:Silicon Graphics Image|Wikipedia article]]
 * {{EGFF|sgiimage|SGI Image File Format File Format Summary}}, from the [[Encyclopedia of Graphics File Formats]]
 [[Category:Silicon Graphics]]

@@ Line 28: / Line 28: @@
 == Specifications ==
-* [ftp://ftp.sgi.com/graphics/grafica/sgiimage.html The SGI Image File Format, Version 1.00]
+* The SGI Image File Format, Draft version 0.97: [https://archive.org/details/ftp.sgi.com-archive ftp.sgi.com archive] → [https://archive.org/download/ftp.sgi.com-archive/ftp.sgi.com/sgi/graphics/SGIIMAGESPEC sgi/graphics/SGIIMAGESPEC]
-* [ftp://ftp.sgi.com/graphics/SGIIMAGESPEC The SGI Image File Format, Draft version 0.97]
+* [http://paulbourke.net/dataformats/sgirgb/sgiversion.html The SGI Image File Format, Version 1.00]
 == Software ==

← Older revision		Revision as of 16:40, 28 September 2019
Line 43:		Line 43:
	* [[Wikipedia:Silicon Graphics Image\|Wikipedia article]]		* [[Wikipedia:Silicon Graphics Image\|Wikipedia article]]
	* {{EGFF\|sgiimage\|SGI Image File Format File Format Summary}}, from the [[Encyclopedia of Graphics File Formats]]		* {{EGFF\|sgiimage\|SGI Image File Format File Format Summary}}, from the [[Encyclopedia of Graphics File Formats]]
		+
		+	[[Category:Silicon Graphics]]